O2 Motorola L6 unlocked?

I bought a Motorola L6 with an O2 cashback deal from Mobileshop. I've
put the new O2 SIM in my old Nokia and want to sell the L6 to a friend
(or failing that on EBay). Is the phone already unlocked or do I have to
get it unlocked before selling it? If it is locked it will still work
for O2, right?

Michael Hoffman wrote:
> I bought a Motorola L6 with an O2 cashback deal from Mobileshop. I've
> put the new O2 SIM in my old Nokia and want to sell the L6 to a friend
> (or failing that on EBay). Is the phone already unlocked or do I have to
> get it unlocked before selling it? If it is locked it will still work
> for O2, right?

Follow-up question: what is a good price to sell this at if I don't auction?